Improved chuck foe pianing-machines



uitrit faire datent fitta JOHN SV. I-IOAR, OF WEST A CTON, MASSACHUSETTS, ASSIGNOR TO HIMSELF, NATHANIEL E. CHTLEILAND CHARLES HASTINGS, 0F THE SAME PLACE. i

Letters .Patent No. 74,360, dated Feruary 11, 18.68.

IMPROVED CHUCK IOB. PLANING-MAGHINES.

TO ALL PERSONS TO WHOM THESE PRESENTS MAY COME:

Be it known that I, JOHN S. HOAR, of WestActom'in the county of Worcester, and State of Massachusetts, have invented an Improved Rotary Chuck for Planing-Machines; land dehereby declare the same to be fully described inthe following specification, and represented in the accompanyingdrawings, of which- Figure 1 is a top view, l

Figure2 a transverse section,

Figure 3 a longitudinal section, j l, Figure 4 aside elevation, I'and l, Figure 5 an end view of it.

In suchdrawings, A denotes a'circular bed-plate, provided with a rib, a, .extending diam'etrically across its rear side. It also has two ears, 6 b, projecting from opposite sides of it, Veach of such ears being recessed or. slotted, as shown at e, in order that by meansof clamp-screws, applied to such ears, the bed-plate maybe fastcned-in or to the mandrel or rotary bed of a planing-machine. The bed-plate A is shown in top view in Figure l 6, as provided with a circular dove-tailed groove, d,or its equivalent, made in its upper` face. This groove has an entrance-passage, @leading laterally from it, in order to enable the heads of two screws,ff, to be passed either into or out of the said groove.4 The said plate A is also provided with a central pivot, g, which projects into a corresponding bearing, h,made in a clamp-plate, B, which is arranged on the plate '.A, and held thereto by means of tie two screws ff, and nuts z' z' the said twoscrews being extended through holes lc lc, made through theplate B, 'and leading into semicircular recesses, Z Z, made in two parallelledges, m m, which project from the plate B, and are arranged therewith in manner as represented. Screws not n u are screwed through one, and toward the other of -the two ledges m m, such screws, with the ledge opposite to that containing them',serving to confine any article to the plate B, or 'in place thereon, between the ledges. These screws also serve to clamp to the ledges an auxiliary clamp-plate, C., which is arranged between the ledges m m, and'is so hinged or connected to them as to be capable of being turned into various acute' angles, with the plate B. Inother words, it

may be adjusted in its angular position with the plate, bymeans of an eccentric, D, arranged between the ledgesv m m', in manner as represented. This eccentric is composed of a. roller having journals eccentric with its diam.- 1

eter, such journals being disposedWin bearings within the ledges. A clamp-nut, fu., is screwed on one of such journals. A separate view of the eccentric, its journal and clamp-nut, is given in `Figure 7., The clamp-plate C is. also furnished with two parallel ledges, o o, extended from it, and also with a series of screws,p ppp, screwed through one ci' such ledges, and in a direction towardl the other, the whole being as exhibited in the drawings. By means of the auxiliary clamp-plate C, and its adjusting-eccentric,D, a tapering ,piece of metal 'may be held and adjusted within the chuck, -so as to be planed bythe planing-machine. The adjustable plate C may be turned over one hundred andeighty degrees with respect to the plate B, so as to enable an article to be placed land'clamped between the ledges of the latter. But, when the auxiliary plate C is'iiat upon the plateV B, the two will he in parallelism, and the plate C will be in. a situation to receive and hold an article whose opposite surfaces may be parallel. Y

I claim as my invention- The combination of the ledges m m and screws n n, ofthe plate B, with such plate and the plate A, applied together by means, and so as to render one plate capable of being revolved on and clamped tothe other, substantiallyas speced.

I also claim the combination, as well as the arrangement, oi' the adjustable eccentricV D, (or its'equivalerit,) and the auxiliary clamp-plate C, (having ledges and screws, as set forth,) with the plates-B and A, arranged and applied together, and provided with clamp-screws, substantially as hereinbefore explained.

I also `claim the combination of the ledges m m, and their screws, with the clamp-plate B, theplate A, the eccentric D, and the auxiliary clamp-plate C, the whole being arranged and applied together in manner andso as to operate substantially as hereinbeiore described. l l j JOHN S. HOAR.

Witnesses:

R. H. EDDY, SAMUEL N. Pirna.' 

